# Characteristic induction motor slip values for variable voltage part load performance optimization

## Abstract

Minimum input power and maximum efficiency occur at a characteristic optimum slip value which can be calculated for any induction motor using methods described. Efficiency is shown to be independent of output power when a variable voltage controller reduces the voltage approximately as the square root of the load torque to maintain the required slip during part load operation. Saturation effects do not significantly change these results. Although a characteristic value of power factor corresponds to optimum slip in the linear motor, it is shown that with saturation there is no single value of optimal power factor. It is also shown that minimum current operation results in much less than optimum efficiency because it requires much smaller than optimum slip.

- Authors:

- Publication Date:

- Research Org.:
- Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI

- OSTI Identifier:
- 6005295

- Resource Type:
- Journal Article

- Journal Name:
- IEEE Trans. Power Appar. Syst.; (United States)

- Additional Journal Information:
- Journal Volume: 102:1

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 20 FOSSIL-FUELED POWER PLANTS; ELECTRIC MOTORS; EFFICIENCY; INDUCTION; OPTIMIZATION; TORQUE; VOLTAGE REGULATORS; MOTORS; 200100* - Fossil-Fueled Power Plants- Power Plants & Power Generation

### Citation Formats

```
Jian, T W, Novotny, D W, and Schmitz, N L.
```*Characteristic induction motor slip values for variable voltage part load performance optimization*. United States: N. p., 1983.
Web. doi:10.1109/TPAS.1983.317995.

```
Jian, T W, Novotny, D W, & Schmitz, N L.
```*Characteristic induction motor slip values for variable voltage part load performance optimization*. United States. doi:10.1109/TPAS.1983.317995.

```
Jian, T W, Novotny, D W, and Schmitz, N L. Sat .
"Characteristic induction motor slip values for variable voltage part load performance optimization". United States. doi:10.1109/TPAS.1983.317995.
```

```
@article{osti_6005295,
```

title = {Characteristic induction motor slip values for variable voltage part load performance optimization},

author = {Jian, T W and Novotny, D W and Schmitz, N L},

abstractNote = {Minimum input power and maximum efficiency occur at a characteristic optimum slip value which can be calculated for any induction motor using methods described. Efficiency is shown to be independent of output power when a variable voltage controller reduces the voltage approximately as the square root of the load torque to maintain the required slip during part load operation. Saturation effects do not significantly change these results. Although a characteristic value of power factor corresponds to optimum slip in the linear motor, it is shown that with saturation there is no single value of optimal power factor. It is also shown that minimum current operation results in much less than optimum efficiency because it requires much smaller than optimum slip.},

doi = {10.1109/TPAS.1983.317995},

journal = {IEEE Trans. Power Appar. Syst.; (United States)},

number = ,

volume = 102:1,

place = {United States},

year = {1983},

month = {1}

}